Synthesis and photoluminescence of Y and Cd co-doped ZnO nanopowder
(1. Key Laboratory of Automobile Materials, Ministry of Education,
Jilin University, Changchun 130025, China;
2. Key Laboratory of Preparation and Applications of Environmental Friendly Materials,
Ministry of Education, Jilin Normal University, Siping 136000, China)
Jilin University, Changchun 130025, China;
2. Key Laboratory of Preparation and Applications of Environmental Friendly Materials,
Ministry of Education, Jilin Normal University, Siping 136000, China)
Abstract: Y and Cd co-doped ZnO nanopowders were prepared via chemical precipitation method in order to modify the band gap and increase the luminescent intensity. The structures and optical properties of the as-synthesized samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and photoluminescence (PL). The effects of Y and Cd ions on the optical properties of the samples were studied. Doping of Y into ZnO evidently increases the intensity of UV emission, or co-doping of Y and Cd enhances the UV emission, narrows the band gap of ZnO and hence red shifts the UV emission at the same time. Therefore, Y and Cd co-doped ZnO nanopowders exhibit an intense violet emission in the room temperature PL spectrum, which could be a potential candidate material for optoelectronic applications.
Key words: ZnO nanopowders; chemical precipitation; optical properties